Report on Klyuchevskoy (Russia) — 29 September-5 October 2010
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 29 September-5 October 2010
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2010. Report on Klyuchevskoy (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 29 September-5 October 2010. Smithsonian Institution and US Geological Survey.
56.056°N, 160.642°E; summit elev. 4754 m
All times are local (unless otherwise noted)
KVERT reported that during 24 September-1 October seismic activity from Kliuchevskoi was above background levels and lava from the summit crater flowed down the SW flank. Satellite imagery analyses showed a large and intense daily thermal anomaly over the volcano. Ash plumes were seen rising to altitudes of 6.5-7 km (21,300-23,000 ft) a.s.l. on 22 and 24 September, and Strombolian activity was observed during 23, 25, and 28-29 September. Ash plumes seen in satellite imagery drifted 185 km E on 22 and 28 September and 78 km W on 24 and 25 September. KVERT noted that eruptive activity from Kliuchevskoi had been continuous since 1 September 2009. The Aviation Color Code level remained at Orange.
Geologic Background. Klyuchevskoy (also spelled Kliuchevskoi) is Kamchatka's highest and most active volcano. Since its origin about 6000 years ago, the beautifully symmetrical, 4835-m-high basaltic stratovolcano has produced frequent moderate-volume explosive and effusive eruptions without major periods of inactivity. It rises above a saddle NE of sharp-peaked Kamen volcano and lies SE of the broad Ushkovsky massif. More than 100 flank eruptions have occurred during the past roughly 3000 years, with most lateral craters and cones occurring along radial fissures between the unconfined NE-to-SE flanks of the conical volcano between 500 m and 3600 m elevation. The morphology of the 700-m-wide summit crater has been frequently modified by historical eruptions, which have been recorded since the late-17th century. Historical eruptions have originated primarily from the summit crater, but have also included numerous major explosive and effusive eruptions from flank craters.